Who are the top Obama campaign contributors?

The top Obama campaign contributors are the University of California, Microsoft and Google. The University of California is the top donor, having contributed $491,868 to the campaign while Microsoft comes in second, donating $443,748. Google follows a significant distance behind with $357,382 in 2012. By June 2012, the Obama campaign, along with supporters, had spent at least $400 million according to the Federal Electoral Commission.